ABS PROBLEM

  • Tiny
  • George Engler
  • 2001 Chevrolet Silverado
  • V8
  • 4WD
  • automatic
  • 285,000 miles

2oo1 Chevy Siverado Z71, ABS brake light comes on except in colder weather. Works fine below 30?
Any ideas?

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Thursday, December 30th, 2010 AT 6:53 PM

3 Replies

  • Tiny
  • saturntech9
  • Expert
  • 29,377 posts

If you could get me the abs code's I could get you the trouble tree's and tell you a lot more about your problem.

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Thursday, December 30th, 2010 AT 6:57 PM
  • Tiny
  • George Engler
  • Member

Codes are as follows:
C0265
C0251
C0246
C0242
C0252
C0245

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Thursday, December 30th, 2010 AT 7:11 PM
  • Tiny
  • saturntech9
  • Expert
  • 29,377 posts

Sorry it took me so long to get back to you I just saw that you had replied to me.I posted the trouble tree for the code's C0251, C0246, C0242, C0252, and C0245. Code C0265 is a code for a internal failure in the ebtcm also. So your best bet is to follow the trouble tree I posted. Here is the description for the code's.
DTC C0241-C0254 or C041-C054

Circuit Description
The ABS relay supplies battery voltage to six valve solenoids (RF dump/isolation, LF dump/isolation, and rear dump/isolation). The EBCM microprocessor applies the grounds needed to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.

Conditions for Running the DTC

* The ignition is ON.
* The vehicle speed is greater than 6 km/h (4 mph).

Conditions for Setting the DTC
The EBCM detects an internal malfunction.

Action Taken When the DTC Sets
C0241, C0242, C0245, C0246, C0251, C0252, C0253, C0254
If equipped, the following actions occur:

* The EBCM disables the DRP/ABS.
* The ABS indicator turns ON.
* The red Brake warning indicator turns ON.

C0243, C0244, C0247, C0248
If equipped, the following actions occur:

* The EBCM disables the ABS.
* The ABS indicator turns ON.

Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids
An intermittent open/shorted solenoid DTC can be set by several different internal EBCM problems. Replace the EBCM if an open/shorted solenoid DTC continues to set intermittently.

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Sunday, January 2nd, 2011 AT 10:05 PM

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